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Message: <blockquote data-quote="Dave_J" data-source="post: 98127" data-attributes="member: 3169">West, I still would run a rubber coupler in the runners due to vibrations left to right.In my days of doing a 2004 WRX, some of the "Tuners"would mill or grind off any not needed item or casting lashings just to shave about 40 pounds off the engine (then go to lunch and scarf down 2 Big Mac's, large fries, large coke with two refills and two apple pies). Some of these mods cost over $500 each and others 100's of man hours. One item that was ported and ground down was the heavy cast aluminum intake manifold. They would heavily grind down all the outsides of the runners to polish them. Then only to have them crack from the vibrations. Now granted they did have a huge intercooler on this but all that was rubber hose mounted and supported by brackets.In our case it would most likely crack at the heat effected zone near a weld.</blockquote>